How does the text differentiate the spiritual outcomes of writing biographies for different types of figures?

The text outlines a hierarchy of spiritual benefits based on the subject of a biography. As detailed in Chapter 0, writing about worldly Gurus, like leaders and writers, is considered a worldly service with limited, non-eternal fruits rooted in self-interest. A step above this is writing the biographies of many saints, which is a form of Guru service that yields spiritual fruits but is described as one-sided or partial and may not lead to the ultimate goal. The highest form of service, which grants the fruit of salvation, is writing the biography of one's own Sadguru and dedicating oneself to its study and recitation.